400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=WRITINGS+GEORGE+WASHIGNTON;+BEING+CORRESPONDENCE,+ADDRESSES,+MESSAGES,+AND+OTHER+PAPERS,+OFFICIAL+AND+PRIVATE.+jared+sparks because the request was invalid.

This might be because the link was created a long time ago. Try your search again on Google. That’s all we know.